"Thank you Supreme Court for explaining to the Prime Minister what democracy is," he said in a post on Twitter.

In a blow to BJP and the Centre, the apex court ordered restoration of Congress government in Arunachal Pradesh by quashing as "unconstitutional" the Governor's decision to advance the Legislative Assembly session by a month in December last.

Uttarakhand Chief Minister Harish Rawat, who had also got relief from the apex court and again taken charge of the state government, lauded the verdict.

"My heartfelt gratitude to the Supreme Court for restoring Cong gov in Arunachal Pradesh. Judiciary has restored faith of people in democracy," Rawat said in a social media post.

The apex court's verdict paves the way for the dismissed Congress government of Nabam Tuki to return to power and sets aside Governor Jyoti Prasad Rajkhowa's message directing the manner of holding the proceedings of sixth session of the Assembly scheduled from January 14, 2016, to December 16-18, 2015. Tuki welcomed the verdict, saying it is "historic" and has protected democracy.